There's an overpopulation in virtually every field. Any graduate student can look to his or her left and right in class and realize that those people are his or

There's an overpopulation in virtually every field. Any graduate student can look to his or her left and right in class and realize that those people are his or her competition for a job that only one of them is going to get. The situation is only somewhat better in STEM fields, because there's more industry demand (where you can get paid more and have better mobility, but get looked down on by your academic brethren.)